WORLD’S SMALLEST, HARDEST CROSSWORD

ACROSS

1. Online opinion piece (4) 5. Mournful wail (4) 6. An S-shaped curve (4) 7. Main part (4)

DOWN

1. Informal party request (abbr) (4) 2. Corporate symbol (4) 3. As yet unpaid (4) 4. A sticky clay (4)